<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>元素阴影</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            background-color: #ff0;
            /* 元素阴影  X轴  Y轴 羽化值 范围 颜色*/
            box-shadow: 5px 5px 5px  5px red;
        }
    </style>
</head>
<body>
     <div></div>
</body>
</html>